I
may just be about to expose the depths of my ignorance

, but here goes...

....
To my humble mind

, a more "diabolical" antique-cartridge to load for (in an antique) would be the .44-40

- a terribly small but necessary neck, same caveats with the "originally for blackpowder", and so on....
"Virgin" 8mm 'Lebel' brass has no neck, and is a "straight-wall" cartridge - I know, I bought 2 bags' worth last year. If you want/have to go the ".32-20 trim" route, that's another thing, but it's not the only way.
Reloading is not a barren wasteland: 2.8 grains of Bullseye is the load recommended for a 115-grain bullet in
Cartridges of the Wold - 11th Ed.
A sufficient number of CGN'ers cast bullets for this cartridge.
So far as cartridges go, this one is - IMHO - not a "monster" to cope with.